Vulcanizing-mold.



' W; A. mooooL'. VULOANIZING MOLD. APPLIOATION FILED 13110.2, 1910.

Patented Mar. 5, 1912.

INVENTOR- (lfi && BY if? UNITED STATES. PATENT OFFICE.

WILLIAM a. m, 'oOIro 'BEAVER rALLs. PENNSYLVANIA, ASSIGNOR "re HERCULESr & RUBBER contrary, a conronarron or DELAWARE.

, v'ULoANIzm'G-MoLn.

:2 wlz" it niay'coace-rn: I

Be it known that I,,VlTILLI AM A. McGoop, a citizen of theUnited-States, residing at Beaver Falls, inth'e countyof Beaver and 5State of Pennsylvania,'- have invented or tires, th-ereare produced,within the bodyof the plastic, steam and gases, particularly sulfurbearing gases, which are diffused in to the vulcanized products in-thatthey give a sponge-like character to said products.

The object of the present invention is to provide means whereby'thesegases. which are produced during the process of vulcaniz'ation,maybe released during said process,

and agowed to escape, thereby the O1 culties above referred to.

To this end my invention comprises a vulcanizing mold h'a ving asurround1ngheating jacket and provided with means for venting thevulcanizin chamber whereby the gases above referr 'to may be allowed toescape, as hereinafter more fully described.

The invention will :best be understood from the following description ofa form or embodiment thereof adapted for use in vulcanizing rubberpneumatic tires and-' illustrated in the accompanying drawings.-

It is to be understood, however, that the construction described andshown has been chosen for illustrative purposes merely, and that theinvention may-be embodied in many 'other' forms and maybeutilized in the5 manufacture of many other articles'without departing fro! .1 thespirit and scope thereof. In said drawings Figure l is a plan view 'of avulcanizing mold constructed in accordance with the invention; Fig. 2 isa transverse sectional view thereof. Fig. 3 is a detail sectional viewillustrating a modified construction. L A a The mold herein showncomprises two complementary annular sections 12 and 13 5 securedtogether by suitable means, such as p I Specification of Letters Patent.Application filed December a, 1910. Serial No. 595,282.

15 other plastic articles, as for example rubber.

the materiaL -and are seriouslydetrime'ntal' overcoming j I mg chamber-20, either'outwardly 'or into ,usual manner, 'and steam Patentedllai'.5, 1912.

swing bolts 14 engaging cars 15, said sections lnclosing a suitablevulcanizing chamber adapted to receive a tire 16'mountcd on its moldingcore 17.

Each of the sections comprises an inner wall 18 inclo'sing thevulcanizing chamber and an outer wall 19 forming the jacket andinclosing a heating chamber 20 between said walls. Suitableheatingfluid, prefer- ,ably steam, is supplied to the. chamber 20 of the jacketthrough suitable connections 21, said acket being preferably providedwith venting pet cocks 22 whose function .wi11b {clear to those skilledinthe art. The mnerwall .18 is'preferably made relatively thin in orderthat the-heat from the heating chamber of the jacket may bereadily.c'omm'unicated' to the article within the mold,

while theouterwall 19.is preferably made relatively thick 'inorder toretain the heat.

In order to provide for venting the vulcanizing chamber there arepreferably provided a 'suitablenumber -of veritapertures 23 extendingfrom the vulcanizing chamber outwardly through the mold. In order torevent the escape of steam from the heat-- the vulcanizing chamber,these vcntaper- .tures, as herein shown, are formed through membersextending between said inner and outer walls. TBreferably these memberswill be made in the .form of nipples 2 extending through said walls, andm screw threaded engagement therewith, as shown in Fig. 2,

although, if" desired, these members may be formed integral with saidinner and outer walls, as shown at 240 in Fig. 3.

The number and arrangement of the vent apertures 23 will preferably besuch that these apertures are distributed at suitable intervalsthroughout the entire body of the mold. As herein shown these aperturesare arranged in three series in each'section of the mold, the aperturesof the respective series being staggered with respect'to one another. ay

-In use the tire orlother article-to be vulcanized is placed withinthemold in the through the connections 21, the air or steam in the chamberof the jacket being first peris admitted mitted to escape through thepetcocks '22,.

until the mold is heated to the desired temperature. after which saidpet cocksare closed. After the vulcanizing chamber has i becomethoroughly heated a suitable pointed implement, such as an and, may' beinserted through ,tl1 eapertures 23 into the bodyof the tire orotheraiti'cle being "vulcanized,

thereby tapping the same and/permitting the gases which have been formedtherein to escape. This operation may be repeated .from time Qto time ifnecessary during-the processof vulcanization, and while the Inaterial isin asufficiently plastic condition' to Close theopenings made by the'ventinglimplemen't. In this manner the gases as they are formed may beallowed to escapefromf the article being vnlcanizedfand after theformation of these gases has ceased the process of 'vulcanization willbe continued and the small'pnnctures formed by the vent1ng"implementwill be completely closed.

Having thus described my-in'ventioii I claim and desire to secure byLetters Pat-- entz' .v

1. A jacketed vulcanizing mold'comp'rising a vulcanizing chamber, alieatin cliamher outside ofsa d vulcanizing cham er and tightly closedto the latter, an inlet for the *heating'medium through theouter Walliofsaid-heating 'chamber and vent apertures assin from said vulcanizin'chamber through said heating chamber an said outer wall, said aperturesextending through con duits'whichare closed to said heating chamber.

' 2. A jacketed vulcanizing mold comp rising l' a vulcanizing chamber, aheating'chamber outside of said vulcanizing chamber and tightly closedtothe latter, an inlet for the heating medium through the outer wall of asaid heating chamber,,and nipples extending bothvsialls of the jacketedmold; and'provided with vent apertures extending -from'.,"saidyul'can'izingf chamber outwar through the said heating chamber 'and itsing an inner. wall inelosingayu1canizmg chamber, an outer wallinclosiiig a heating'chamber outside of said inner Wall, and nipplesextending through said walls, said nipples having vent aperturesextending from said vulcanizing chamber through-the 5 ,said heatingchamber and the-outer wall I of the latter. g a '4. A jacketedvuleanizing mold.com pris-"-" ing an inner wall inclosl' g a vulcamzingchamber, an outer wall inclosing a heating chamber outside of said innerwall; and apertured nipples extending through-said walls and in threadedengagement therewith,'-'said apertured nipples serving to vent said,v1'11- chamber through said-heating canizing chamber andsald outer,wall.

-5. A-jacketed v'ulcamzmg mold comprising a relatively thin inneryvall'incl'qsini 'a vulcanizing chamber, -a,relatively 'thic outer'wall'inclosin'g a heating chamber outas;

